TiO2 material that is absorbent in the visible spectrum and method for producing same

Patent metadata

Field	Value
Publication number	US-9908100-B2
Application number	US-201515114757-A
Country	US
Kind code	B2
Filing date	Jan 27, 2015
Priority date	Jan 27, 2014
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

The invention relates to a method for the production of a TiO 2 material comprising:
preliminary mixing a titanium alkoxide with an acid; adding water, a phase separator and of an N source to the mixture thereby obtaining a TiO 2 gel; washing the TiO 2 gel with isopropanol; drying and calcining the TiO 2 gel to produce the material.

The invention also relates to a TiO 2 material exhibiting an absorbance in the visible spectrum and in particular a light absorption at 500 nm which is greater than 50% of the light absorption at 400 nm, and its use as photocatalyst for the degradation of pollutants in air or water and water splitting into H 2 , under radiation in the visible spectrum.

First claim

The invention claimed is:

1. A method for the production of a TiO 2 material comprising: preliminary mixing a titanium alkoxide with an acid;
adding water, a phase separator and an N source to the mixture of titanium alkoxide and acid, thereby obtaining a TiO 2 gel;
washing the TiO 2 gel with isopropanol (iPrOH);
drying and calcining the TiO 2 gel to produce the TiO 2 material exhibiting open mesopores and macropores, the mesoporous volume being greater than 0.1 cm 3 /g and the macroporous volume being greater than approximately 0.3 cm 3 /g, the TiO 2 material comprising at least 60 wt. % TiO 2 in the form of anatase and elemental carbon and/or element nitrogen in a quantity lower or equal to approximately 2%, the percentages being calculated with respect to the total weight of the material.

2. The method of claim 1 , wherein the titanium alkoxide is Ti(OiPr) 4 .

3. The method of claim 1 , wherein the titanium alkoxide:acid molar ratio is between 1:1 and 1:0.5.

4. The method of claim 1 , wherein the acid is HCl.

5. The method of claim 1 , wherein the phase separator is poly(ethylene oxide) (PEO) having a number average molar mass (Mn) of greater than or equal to 10 000.

6. The method of claim 1 , wherein the titanium alkoxide:N source molar ratio is between 1:1 and 1:0.75.

7. The method of claim 1 , wherein the N source is N-methylformamide (NFA).

Assignees

• Total Sa
• Centre National De La Rech Scientifique—Cnrs
• Enscm

Inventors

• Boscaro Paolo
• Hulea Vasile
• Marcotte Nathalie
• Fajula François
• Galarneau Anne
• Luck Francis

Classifications

• B01J21/063 Primary

  Titanium; Oxides or hydroxides thereof · CPC title

• B01J27/20

  Carbon compounds · CPC title

• B01D2255/802

  Photocatalytic · CPC title

• C02F1/725

  by catalytic oxidation · CPC title

• B01D2258/06

  Polluted air · CPC title